Solve LaTeX: \displaystyle x^{2} + 6 x + 25 = 0

Using the quadratic formula gives LaTeX: \displaystyle x=\frac{ -(6)\pm \sqrt{ (6)^2 -4(1)(25) } }{ 2(1) }
Simplifying gives LaTeX: \displaystyle x=\frac{ -6 \pm \sqrt{ -64 } }{ 2 } = -3 \pm -4 i